Thrombosis and Haemostasis, Table of Contents Thromb Haemost 2004; 91(04): 827-828DOI: 10.1055/s-0037-1614273 Letters to the Editor Schattauer GmbH Overestimation of plasma level of factor V coagulant activity due to unrecognised preanalytical coagulation Valerie Eschwège , Melanie Trillard , Annie Robert Recommend Article Abstract Buy Article Full Text References References 1 Polack B, Schved JF, Boneu B. Groupe d’Etude sur l’Hemostase et la Thrombose (GEHT). Preanalytical recommendations of the ‘Groupe d’Etude sur l’Hemostase et la Thrombose’ (GEHT) for venous blood testing in hemostasis laboratories. Haemostasis 2001; 31 (01) 61-8. 2 Bartels PC, Schoorl M, van Bodegraven AA. Reduction of preanalytical errors due to in vitro activation of coagulation. Clin Lab 2001; 47: 449-52.